1、MIL-C-238V2B m 9999906 1858427 2T4 m Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, Naval Sea Systems Command, Am: 03Q42 2531 Jefferson Davis Hwy, Arlington, VA 22242-5160 by using t
2、he self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. 4 I INCH-POUND 1 MIL -C-23842B( SH) 14 July 1993 SUPERSEDING 22 June 1982 (See 6.10) MIL-C-23842A( SH) MILITARY SPECIFICATION CONVEYOR, VERTICAL, TRAY TYPE, FOR 3000 POU
3、ND PALLETIZED LOADS (SHIPBOARD USE) This specification is approved for use by the Naval Sea Systems Command, Department of the Navy, and is available for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers powered tray type vertical conveyo
4、rs used to move palletized loads up to 3 pounds aboard Naval ships. Only one classification of conveyor is covered by this specification. 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications, standards, and handbooks. The following specifications, standards and handbooks form a par
5、t of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those listed in the issue of the Department of Defense Index of Specifications and Standards (DODISS) and supplement thereto, cited in the solicitation (see 6.2). O SPECIFICATIONS FEDERAL
6、 FF-B-171 - Bearings, Ball, Annular (General Purpose) AMSC NIA FSC 3910 DISTRIBUTION STATEMENT A Approved for public release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-23842B D 9999406 LB58428 130 - MIL-C-23842B
7、( SH) FF-B-185 - Bearings, Roller, Cylindrical; and Bearings Roller, Self-aligning. IT-C-490 - Cleaning Methods for Ferrous Surfaces and Pretreatments for Organic Coatings. IT-P-645 - Primer, Paint, Zinc-Molybdate, Alkyd Type. T-P-1757 - Primer Coating, Zinc Chromate, Low-MoistureSensitivity. MILITA
8、RY MIL-S-901 - Shock Tests, H.I. (High-Impact) Shipboard Machinery, Equipment, and Systems, Requirements for. MIL-C-2212 - Contactors and Controllers, Electric Motor AC or DC, and Associated Switching Devices. MIL-M-3184 - Machinery: Deck and Vehicle Mounted with Associated Equipment and Provisioned
9、 (Repair Parts) Items; Packaging of. MIL-M-7793 - Meter, Time Totalizing. MIL-M-7793/8 - Meter, Time Totalizing, Miniature, Digital, 115 Volts, 60 or 400 Hz. MIL-P-15024 - Plates, Tags and Bands for Identification of Equipment. MIL-P-15024/5 - Plates, Identification. MIL-E-15090 - Enamel, Equipment,
10、 Light-Gray (Formula No. 111). MIL-C-15306 - Call-Signal Stations (Type ICD) (Hand Crank Magneto and Call-Signal). MIL-T-15514 - Telephone Equipment, Sound Powered Handsets, Headset-Chest Sets, and Headset-Microphones, Types H-200/U, H-201/U, H-202/U, H-203/U, and H-204W. MIL-3-16392 - Brakes, Magne
11、t, Naval Shipboard. MIL-M-17060 - Motors, 60-Hertz, Alternating Current, Integral-Horsepower, Shipboard Use. MIL-C-24707 - Castings, Ferrous, General Specification for. MIL-C-24707/5 - Castings, Ductile Iron and Austenitic Ductile Iron. 2 Provided by IHSNot for ResaleNo reproduction or networking pe
12、rmitted without license from IHS-,-,-MIL-C-23iZB 7799906 15Y29 077 MILC-23842B( SH) FED-STD-HB - Screw-Thread Standards for Federal Services. FED-STD-H28/2 - Screw-Thread Standards for Federal Services Section 2 Unified Inch Screw Threads-UN and UNR Thread Forms. MILITARY MIGSTD-278 - Welding and Ca
13、sting Standard. MIGSTD-471 - Maintainability VerificatiodDemonstrationEvaluation. MILSTD-740-1 - Airborne Sound Measurements and Acceptance Criteria of Shipboard Equipmen t. MIL-STD-740-2 - Structureborne Vibratory Acceleration Measurements and Acceptance Criteria of Shipboard Equipment. HANDBOOKS M
14、ILITARY MIL-HDBK-267 - Guide For Selection of Lubricants and Hydraulic Fluids For Use In Shipboard Equipment. (Unless otherwise indicated, copies of federal and military specifications, standards, and handbooks are available from the Standardization Documents Order Desk, Building 4D, 700 Robbins Ave
15、., Philadelphia, PA 1911 1-5094 2.2 Non-Government publications. The following document(s) form a part of this document to the extent specified herein. Unless otherwise specified, the issues of the documents which are DOD adopted are those listed in the issue of the DODISS cited in the solicitation.
16、 Unless otherwise specified, the issues of documents not listed in the DODISS are issues of the documents cited in the solicitation (see 6.2). AMERICAN GEAR MANUFACTURERS ASSOCIATION (AGMA) American Gear Manufacturers Association Gear Handbook (Application for copies should be addressed to the Ameri
17、can Gear Manufacturers Association, 1500 King St., Suite 201, Alexandria, VA 22314.) 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-23842B 9999906 1858430 899 c AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI) B29.1 - Precision Power Transmissio
18、n Roller Chains, Attachments, and Sprockets. (DOD adopted) S1.4 Specification for Sound Level Meters. (Application for copies should be addressed to the American National Standards Institute, 1430 Broadway, New York, NY 10018.) AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) A 36/A 36M - Standard
19、Specification for Structural Steel. (DOD adopted) A 47 Standard Specification for Ferritic Malleable Iron Castings. (DOD adopted) A 167 - Standard Specification for Stainless and Heat-Resisting Chromium-Nickel Steel Plate, Sheet and Strip. (DOD adopted) (Application for copies should be addressed to
20、 American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103.) (Non-Government standards and other publications are normally available from the organizations that prepare or distribute the documents. These documents also may be available in or through libraries or other info
21、rmational services.) . 2.3 Order of precedence. In the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been
22、 obtained. 3. REQUIREMENTS 3.1 Materials. Materials shall be free from any defects and imperfections that might affect the serviceability or appearance of the finished product. Materials shall be in compliance with the requirements specified herein. Materials not definitely specified herein shall be
23、 of a quality to meet the performance requirements specified herein. Where materials are not identified the following order of preference shall apply: (a) Industry or technical society specification or standard. (b) Federal specification. (c) Military specification. (d) Manufacturers specification o
24、r standard. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MfL-C-23842B m 9999906 1858431 i25 m MIL-C-23842B( SH) Where materials other than those covered by the material references are to be used, the drawings shall show the complete chemical and
25、 physical properties of the material. Components shall be compatible for use with lubricants as specified in 3.2.3. 3.1.1 Cast iron. Cast iron in any form shall not be used except where permitted by referenced specifications. The use of malleable cast iron is limited to ASTM A 47. Cast nodular graph
26、itic iron in accordance with MIL-C-24707 and MIL-C-24707/5 may be used for machinery equipment components. 3.1.2 Cam track. Cam track, guides for the tray guide arm rollers, shall be corrosion resistant steel in accordance with ASTM A 167, type 304 and shall be of the uninterrupted cam track design.
27、 3.13 Roller chains. Roller chains, their attachments, and all hardware shall be in accordance with ANSI B29.1. 3.1.4 Chain sprockets. Chain sprockets shall be in accordance with ANSI B29.1. 3.1.5 Other components. Component parts of the conveyor shall be constructed or selected for minimum weight c
28、onsistent with stress requirements herein and shall meet design and operational requirements. 3.1.6 Recovered materials. Unless otherwise specified herein, all equipment, material, and articles incorporated in the products covered by this specification shall be new and may be fabricated using materi
29、als produced from recovered materials to the maximum extent practicable without jeopardizing the intended use. The term “recovered materials“ means materials which have been collected or recovered from solid waste and reprocessed to become a source of raw materials, as opposed to virgin raw material
30、s. None of the above shall be interpreted to mean that the use of used or rebuilt products is allowed under this specification unless otherwise specifically specified. 3.2 Construction. Each conveyor shall be a complete unit, including trunk, cam tracks, tray guides, liners, trays, overload devices,
31、 sprocket and sprocket assemblies, chains, chain tensioner, controller, pushbutton stations, interlocks, photo cells, and associated mechanical and electrical drive equipment. The configuration of the conveyor shall be in accordance with figure 1 (see 6.3, 6.5, and appendix). 3.2.1 Structure. Where
32、practicable, welded steel construction shall be used in lieu of castings. 3.2.2 Fasteners. Keys, collars, nuts, bolts, studs, setscrews, and other parts that tend to work loose shall be fastened in a positive manner using cotter pins, safety wires, or other suitable methods. Threaded parts shall hav
33、e threads in accordance with FED-STD-H2 and FED-STD- H28/2. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-23842B m 99999Ob I1858432 bbL m 3.23 Lubrication. Means for the lubrication of all metallic surfaces in sliding or rolling contact sha
34、ll be provided. Lubrication fittings shall be accessible without the disassembly of any components. Cam tracks shall not require lubrication. Lubricants shall be in accordance with MIL-HDBK-267. 3.2.4 Bearings. Rotating parts shall be mounted on ball or roller bearings to suit the intended use, in a
35、ccordance with FF-B-171 and FF-B-185. Bearings shall be selected for 10, hours minimum operating life under rated conveyor operating loads and as recommended by the bearing manufacturer, with load ratings, including applicable safety factors, greater than the maximum bearing loads under extreme oper
36、ating conditions specified herein (see 6.3 and 6.7). Shaft bearings shall be sealed to keep out dirt and moisture. 3.2.5 Liners. Liners shall be provided to prevent jamming due to a pallet shifting in any direction on a moving tray during transit and to afford maximum protection to operating personn
37、el. Liners shall have a smooth configuration to prevent pallets from being snagged. Conveyor liners shall be mounted and fastened to permit removal. The rear liner shall be built to withstand impact from palletized load, without being deformed, when load is being positioned on tray by forklift truck
38、. 3.2.6 Carrier chains. Adjustment shall be provided for tension of the carrier chains. Adjustment shall allow for removal of the tail sprocket without parting the chain. Provision shall be made for disengagement of sections of the carrier chains between trays to permit repairs. 3.2.7 Tracks. Cam tr
39、acks shall provide positive guidance for tray travel without binding of tray motion and shall provide a smooth transition of each tray as it travels from its horizontal (load carrying) position to its vertical (idle return) position. Vertical track sections shall be replaceable by bolting or other n
40、on-welded means. Tail cam track panels shall have fiied (dead) center chain sprocket arrangements. 3.2.8 Base cleanout access. A cleanout door shall be provided at the base of the structure to provide means of keeping the conveyor interior clear of debris. Access opening shall be not less than 18 by
41、 24 inches. 3.2.9 Frame. The conveyor frame shall be the unitized trunk type, and shall be constructed of steel in accordance with ASTM A 36/A 36M. The complete conveyor assembly or each section of conveyor length shall be provided with lifting attachments to permit handling of unit in a vertical at
42、titude. The trunk shall withstand pressures required to meet the tightness requirements (i.e air tight, oil tight, watertight, etc.) of the ship in which conveyor will be installed (see 6.2). 3.2.10 Configuration. Unless otherwise specified (see 6.2), the conveyor shall have a configuration as shown
43、 on figure 1. The conveyor shall serve decks as specified (see 6.2). 3.2.10.1 Trays. The number of trays shall be determined by the nominal tray spacing (see 6.2) and the number of decks penetrated by the conveyor. 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without licens
44、e from IHS-,-,-, flrl-kC-23842B = 9999906 1858433 5TB 3.2.10.2 Machinery. The machinery arrangement shall be for right-hand or left-hand drive as specified (see 6.2.). 3.2.10.3 Sections. Conveyors greater than 50 feet overall length may be made up of two mating sections approximately equal in length
45、. The section joint shall equal the maximum strength of the section. 3.2.10.4 Welded fabrication. Welded fabrication and inspection shall be in accordance with MIL-STD-278. 3.2.11 Ship motion. 3.2.11.1 Conveyor alignment. Design and installation of the trunk and conveyor shall result in a structure
46、which shall maintain alignment and shall operate in accordanc with the requirements of this specification after the ship has been subjected to a 30-degree roll, a 4-degree pitch, or combination of the two. 3.2.11.2 Conveyor operation. The conveyor shall operate without adverse effect with a conveyor
47、 rated capacity load at rated speed under any combination of the following ship motion combinations: (a) Roll - From 15 degrees port to 15 degrees starboard and return in a full period of 9 seconds. (b) Pitch - From 4 degrees up to 4 degrees down and return in a full period of 6 seconds. The conveyo
48、r shall also operate without adverse effect with a conveyor rated capacity load at rated speed when the ship is permanently listed 15 degrees to one side and trimmed 4 degrees down by the bow or by the stern. 3.2.12 High-impact shock. When specified (see 6.2), the conveyor drive machinery shall comp
49、ly with the requirements for grade B equipment when tested as specified. Certification of compliance with the test requirements for high-impact shock, from a Government approved test facility is acceptable in lieu of the shipboard shock test (see 4.6.8). (a) Test specification - MIL-S-901. (b) Shockproofness required - grade B. (c) Equipment classification - deck mounted. (d) Class of equipment - class I. (e) Class of test - medium weight test. (f) Typ
